PL5501
High Efficiency 4-Switch Buck-Boost Controller
DS-PL5501-Rev. 1.0
www.powlicon.com
1 of 15
2019-02-18
© Powlicon Inc.
1 Features
Buck-Boost Controller for Step-Up/Step-Down
DC/DC Conversion
Dynamical programming of Output current and
Output voltage using PWM signal or analog signal
2V to 32 V wide output range
Comprehensive protection features including
Output Short Protection (OSP), Cycle-by-Cycle
input and output Peak Current Limit, thermal
regulation, thermal shutdown, input UVLO, input
OVP, output OVP etc.
Adjustable Switching Frequency using resistor
Frequency dithering for good EMI performance
Integrated 2-A MOSFET Gate Drivers
Input or Output Average Current Limiting with
stable CC loop
5V/55mA low I
q
LDO to power system MCU
Available in QFN4x4-32 Package
2 Applications
Automotive Start-Stop Systems
Industrial PC Power Supplies
USB Power Delivery
Car charger
HUB Power
3 Description
PL5501 is a synchronous 4-switch Buck-Boost
controller capable of regulating the output voltage at
above or below the input voltage. PL5501 operates
over a wide input voltage range of 3.6 V to 32 V (36 V
maximum) to support a variety of applications.
PL5501 employs Constant ON time control in buck,
boost and buck-boost operation modes for superior
load and line regulation. The switching frequency
could be set to 150kHz, 300kHz, 600kHz or 1200kHz
based on different resistor value between FREQ pin
and GND pin. The device also features a
programmable soft-start function and offers all kinds
of protection features including cycle-by-cycle current
limiting, input under voltage lockout (UVLO), output
over voltage protection (OVP), input Over Voltage
Protection, thermal shutdown and output short
protection etc.
VADJ, IADJ pins are used to program output VBUS
voltage and output current limit, provides voltage
control loop, constant current loop, thermal regulation
loop, temperature sensing, which makes PL5501
an excellent option for USB Power Delivery (PD)
application.
4 Typical Application Schematic
Fig. 1 Application Schematic
VIN
SW1
SW2
SW1
LG1
HG1
CSN1
CSP1
BST1
BST2
SW2
COMP
VDD
LDO
IREF
LG2
HG2
CSN2
CSP2
FB2
VIN
EN
TS
VCC
VBUS
EN
VREF
IADJ
I-PWM
VADJ
V-PWM
RCS1
RCS2
FREQ
VBUS
TS
33-GND
PL5501
AGND
PL5501
DS-PL5501-Rev. 1.0
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2019-02-18
© Powlicon Inc.
5 Pin Configuration and Functions
33-GND
PL5501
32
31
COMP
VREF
AGND
27 26 25
CSN1
EN
VBAT
CSP1
9
10
11 12 13 14 15
FB2
7
6
5
4
IREF
NC
3
2
1
IADJ
NC
VADJ
VDD
17
21
22
23
24
LG1
BST1
SW1
SW2
VBUS
2830 29
CSN2
CSP2
LDO
FREQ
NC
8
18
BST2
TS
HG2
16
HG1
VCC
19
20
LG2
NC
NC
Fig. 2 Pin-Function (QFN4X4-32)
Pin
Description
Number
Name
1
VADJ
Connect a 0-2V analog voltage or a PWM signal to program voltage reference on VREF pin.
Connect this pin to VDD will force VREF to constant 2V.
2
IADJ
Connect a 0-2V analog voltage or a PWM signal to program voltage reference on IREF pin.
Connect this pin to VDD will force IREF to 2V.
3,6,8,11,
30
NC
4
IREF
Reference voltage for input and output current limiting loop.
5
VREF
Voltage reference for voltage control loop
7
LDO
Low quiescent current 5V/55mA LDO. Directly powered from VIN pin. LDO can be used as
power supply for application processor such as MCU. When EN is low, only this LDO will be
active to power MCU and keep low quiescent current for the whole system.
9
FREQ
Connect to GND to set the switching frequency at 150kHz. Connect this pin to VDD to set
switching frequency at 300kHz. Connect to a resistor divider between VDD and GND to set
frequency to 600k and 1200k Hz.
10
COMP
Error Amplifier output.
12
FB2
VBUS voltage feedback. Connect a resistor divider between VBUS and GND to FB2 to
program VBUS voltage.
13
CSN2
The minus input of output current sense.
14
CSP2
The positive input of output current sense.
15
VBUS
Connect this pin to the output voltage.
16
HG2
High side MOSFET driver 2.
17
BST2
Boost pin for high side MOSFET driver 2.
18
SW2
Connect this pin to the Switching point 2 of the power stage.
19
LG2
Low side MOSFET driver output 2.
20
VCC
6.6V power supply for high side and low side driver
21
LG1
Low side MOSFET driver output1.
22
SW1
Connect this pin to the Switching point1 of the power stage.
23
BST1
Boost pin for high side MOSFET driver1.
24
HG1
High side MOSFET driver1.
25
VIN
Connect this pin to the Input voltage.
26
CSP1
The positive input of input current sense.
PL5501
DS-PL5501-Rev. 1.0
www.powlicon.com
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2019-02-18
© Powlicon Inc.
27
CSN1
The minus input of input current sense.
28
EN
Logic High will enable the converter. Logic Low will disable the whole PL5501 except LDO.
Only LDO is working to power system MCU when EN is low. EN is pulled high internally by a
high value resistor.
29
AGND
Signal Ground.
31
TS
temperature sense
32
VDD
5.4V power supply for PL5501 control core.
6 Device Marking Information
Part Number
Order Information
Package
Package Qty
Top Marking
PL5501
PL5501IQN32
QFN4x4 - 32
4000
5501
RAAYMD
PL5501: Part Number
RAAYMD: RAA: LOT NO.; YMD: Package Date